The NE5532 is widely used in a variety of audio equipment and is popular in amateur radio practice. The NE5532 is a dual low-noise operational amplifier with a low operating current of 8mA, operating from a bipolar power supply with a voltage of ±5V … ±15V.
As can be seen from the block diagram, the NE5532 circuit is equipped with output short circuit protection and diode protection for the input of the amplifier.
Specifications of the NE5532
Number of channels (#): 2
Total supply voltage (Min) (+5V=5, +/-5V=10): 10
Total supply voltage (Max) (+5V=5, +/-5V=10): 30
GBW (Typ) (MHz): 10
Slew rate (Typ) (V/us): 9
Vos (offset voltage @ 25 C) (Max) (mV): 4
Iq per channel (Typ) (mA): 4
Vn at 1 kHz (Typ) (nV/rtHz): 5
Features: Standard Amps
THD + N @ 1 kHz (Typ) (%): 0.002
Operating temperature range (F): 32 to 158
Output current (Typ) (mA): 38
CMRR (Typ) (dB): 100
Input bias current (Max) (pA): 800000
The excellent range of supply voltages of the NE5532 chip, a low level of distortion of its noise, a good rate of increase of the output voltage allows you to build based on this microcircuit various and interesting amateur radio designs.
Below is the pinout of the NE5532 chip:
Pin assignment of the chip:
1OUT – Channel 1 output
1IN- -Channel 1 inverting input
1IN+ – Channel 1 non-inverting input
Vcc- – Negative supply voltage
2OUT – Channel 2 output
2IN- – Inverting input of channel 2
2IN+ – Non-inverting input of channel 2
Vcc+ – Positive supply voltage
The following chips may be referred to as analogs:
An Example of Using the NE5532
A wide range of power supply voltage NE5532, low distortion, low self-noise, high rate of output voltage rise allows you to build based on this chip a variety of ham radio devices.
The microphone preamplifier described here is designed for a small electret microphone. The circuit of this preamplifier is very simple and based on available components.
The operational amplifier NE5532 provides about 30dB gain. This increase depends on the value of the resistors R3 and R4. If you want to be able to change the gain, simply replace resistor R4 with a 470K potentiometer with a 10K resistor in series. The total gain, in this way, can vary from 10 to 45 dB. The wires for the audio signal must be shielded.